Răspuns :
a-b=144
a:b=7rest18
a=7b+18
7b+18-b=144
6b+18=144
6b=126
b=21
a=7*21+18
a=165
165+21=186
a:b=7rest18
a=7b+18
7b+18-b=144
6b+18=144
6b=126
b=21
a=7*21+18
a=165
165+21=186
a-b=144 iar a:b= 7 rest 18 => a=7b +18.Inlocuim in prima relatie. => 7b+18-b=144=> 6b=144-18 => 6b=126 => b=21 iar a= 7×21+18=147+18= 165